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			1. 初始化阶段: 由ReactDOM.render()触发---初次渲染
							1.	constructor()
							2.	getDerivedStateFromProps 
							3.	render()
							4.	componentDidMount()
			2. 更新阶段: 由组件内部this.setSate()或父组件重新render触发
							1.	getDerivedStateFromProps
							2.	shouldComponentUpdate()
							3.	render()
							4.	getSnapshotBeforeUpdate
							5.	componentDidUpdate()
			3. 卸载组件: 由ReactDOM.unmountComponentAtNode()触发
							1.	componentWillUnmount()


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